550
FNCA52 TJSJ 040730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST MON MAY 4 2026
DISCUSSION
LITTLE TO NO RAINFALL IS ANTICIPATED ACROSS THE SOUTHERN SECTIONS
OF PUERTO RICO TODAY. DRIER AIR IS ALSO EXPECTED TO FILTER INTO
THE REGION, ALLOWING RELATIVE HUMIDITY VALUES TO DROP INTO THE
UPPER 40S TO LOW 50S. WIND SPEEDS MAY REACH AROUND 16 TO 21 MPH,
WITH HIGHER GUSTS. KBDI VALUES IN CABO ROJO REMAIN ABOVE CRITICAL
FIRE WEATHER THRESHOLDS. ADDITIONALLY, THE 7-DAY PERCENT OF
NORMAL RAINFALL ACROSS THE SOUTHEASTERN COASTAL PLAIN, INCLUDING
AREAS NEAR SALINAS, IS BELOW 25%, WITH SOME LOCATIONS EVEN BELOW
5%. THEREFORE, CONDITIONS WILL BE FAVORABLE FOR THE SPREAD OF
WILDFIRES ALONG THE SOUTHERN COASTAL PLAINS OF PUERTO RICO. A
FIRE DANGER STATEMENT (RFDSJU) HAS BEEN ISSUED.
PRZ014-042000-
SOUTHEAST COASTAL PLAINS-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 20
TEMP (24H TREND) 89 (+2) 73 (-2) 89
RH % (24H TREND) 53 (-7) 90 (+5) 55
WIND 20FT/EARLY(MPH) E 13 G21 E 8 E 12
WIND 20FT/LATE(MPH) SE 13 E 6 SE 11
MIXING HGT(FT-AGL/MSL)4680 4520
TRANSPORT WND (MPH) SE 20 SE 17
VENT RATE (KT-FT) 79560 67800
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-042000-
SOUTHERN HILLS-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 86 (+3) 69 (-4) 86
RH % (24H TREND) 60 (-5) 97 (+8) 63
WIND 20FT/EARLY(MPH) E 13 E 8 SE 11
WIND 20FT/LATE(MPH) SE 13 E 8 SE 10
MIXING HGT(FT-AGL/MSL)5380 5470
TRANSPORT WND (MPH) SE 18 SE 13
VENT RATE (KT-FT) 86080 60170
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-042000-
NORTH COASTAL PLAINS-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 50
TEMP (24H TREND) 91 (+2) 72 (-3) 91
RH % (24H TREND) 55 (-4) 96 (+7) 58
WIND 20FT/EARLY(MPH) SE 12 SE 12 SE 13
WIND 20FT/LATE(MPH) E 14 SE 6 E 14
MIXING HGT(FT-AGL/MSL)6030 5550
TRANSPORT WND (MPH) SE 15 SE 13
VENT RATE (KT-FT) 78390 61050
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-042000-
NORTHERN HILLS-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 0 50
TEMP (24H TREND) 90 (+2) 70 (-2) 90
RH % (24H TREND) 54 (-5) 96 (+5) 60
WIND 20FT/EARLY(MPH) SE 10 SE 10 SE 11
WIND 20FT/LATE(MPH) SE 12 LGT/VAR E 12
MIXING HGT(FT-AGL/MSL)6660 6190
TRANSPORT WND (MPH) SE 14 E 9
VENT RATE (KT-FT) 79920 49520
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-042000-
WEST COAST-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 30
TEMP (24H TREND) 91 (+1) 73 (-1) 91
RH % (24H TREND) 55 (-6) 95 (+7) 60
WIND 20FT/EARLY(MPH) E 16 SE 12 SE 13
WIND 20FT/LATE(MPH) SE 16 E 8 E 13
MIXING HGT(FT-AGL/MSL)5020 5020
TRANSPORT WND (MPH) SE 14 SE 15
VENT RATE (KT-FT) 60240 65260
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-042000-
EASTERN INTERIOR-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 40
TEMP (24H TREND) 88 (+3) 71 (-3) 87
RH % (24H TREND) 60 (-2) 97 (+8) 62
WIND 20FT/EARLY(MPH) SE 12 SE 11 SE 13
WIND 20FT/LATE(MPH) SE 13 SE 10 SE 13
MIXING HGT(FT-AGL/MSL)5740 5940
TRANSPORT WND (MPH) SE 18 SE 14
VENT RATE (KT-FT) 91840 71280
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-042000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 60
TEMP (24H TREND) 83 (+3) 70 (-3) 83
RH % (24H TREND) 67 (-4) 99 (+8) 69
WIND 20FT/EARLY(MPH) SE 11 SE 9 SE 12
WIND 20FT/LATE(MPH) SE 12 SE 8 SE 12
MIXING HGT(FT-AGL/MSL)4400 4220
TRANSPORT WND (MPH) SE 20 SE 17
VENT RATE (KT-FT) 74800 63300
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-042000-
CENTRAL MOUNTAIN RANGE-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 40
TEMP (24H TREND) 88 (+6) 67 (-3) 87
RH % (24H TREND) 56 (-10) 98 (+7) 63
WIND 20FT/EARLY(MPH) SE 12 SE 6 SE 10
WIND 20FT/LATE(MPH) SE 12 LGT/VAR SE 9
MIXING HGT(FT-AGL/MSL)6320 7080
TRANSPORT WND (MPH) SE 15 SE 9
VENT RATE (KT-FT) 82160 56640
DISPERSION 5 5
DSI 6 1 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-042000-
CAYEY MOUNTAIN RANGE-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40
TEMP (24H TREND) 83 (+3) 70 (-2) 82
RH % (24H TREND) 68 (0) 98 (+6) 70
WIND 20FT/EARLY(MPH) SE 11 SE 6 SE 10
WIND 20FT/LATE(MPH) SE 11 SE 6 SE 10
MIXING HGT(FT-AGL/MSL)4990 4800
TRANSPORT WND (MPH) SE 20 SE 16
VENT RATE (KT-FT) 84830 67200
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-042000-
VIEQUES-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 50
TEMP (24H TREND) 87 (+1) 76 (-2) 87
RH % (24H TREND) 62 (+1) 87 (+4) 63
WIND 20FT/EARLY(MPH) SE 14 SE 13 SE 14
WIND 20FT/LATE(MPH) SE 14 E 13 SE 13
MIXING HGT(FT-AGL/MSL)3310 3160
TRANSPORT WND (MPH) SE 20 E 17
VENT RATE (KT-FT) 56270 47400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-042000-
CULEBRA-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 50
TEMP (24H TREND) 89 (+2) 77 (-2) 89
RH % (24H TREND) 62 (-1) 89 (+6) 62
WIND 20FT/EARLY(MPH) E 13 SE 14 SE 16
WIND 20FT/LATE(MPH) E 14 E 13 SE 16
MIXING HGT(FT-AGL/MSL)3370 3260
TRANSPORT WND (MPH) SE 20 SE 18
VENT RATE (KT-FT) 57290 52160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-042000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 91 (+2) 74 (-1) 91
RH % (24H TREND) 46 (-12) 93 (+9) 52
WIND 20FT/EARLY(MPH) E 18 G27 E 13 SE 14 G23
WIND 20FT/LATE(MPH) SE 18 G27 E 11 SE 14 G23
MIXING HGT(FT-AGL/MSL)4830 4850
TRANSPORT WND (MPH) SE 22 SE 16
VENT RATE (KT-FT) 91770 67900
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-042000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 40
TEMP (24H TREND) 86 (+1) 74 (-4) 86
RH % (24H TREND) 64 (-1) 95 (+10) 65
WIND 20FT/EARLY(MPH) E 14 E 13 SE 17
WIND 20FT/LATE(MPH) E 14 E 13 SE 17
MIXING HGT(FT-AGL/MSL)3340 3210
TRANSPORT WND (MPH) E 20 SE 18
VENT RATE (KT-FT) 56780 51360
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-042000-
ST CROIX-
330 AM AST MON MAY 4 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 30
TEMP (24H TREND) 87 (+1) 76 (-2) 87
RH % (24H TREND) 66 (+2) 89 (+6) 64
WIND 20FT/EARLY(MPH) E 14 E 13 E 16
WIND 20FT/LATE(MPH) E 14 E 13 SE 14
MIXING HGT(FT-AGL/MSL)4090 4260
TRANSPORT WND (MPH) E 21 SE 18
VENT RATE (KT-FT) 73620 68160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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